Compiles a QuakeC program to Elixir: every function becomes a function of a generated module, and a dispatch module calls one by its index.

dispatch = QuakeC.Compiler.load(progs)
{host, budget, returned} =
  dispatch.call(function_index, argc, host, {builtins, trace}, budget, args)

args is a tuple of the words of the arguments, three a parameter, and returned the three words of the return value. A builtin is called with the arguments in the parameter slots from 4, and its return value is read from the return slots 1 to 3. dispatch.call_with_args/7 takes the same and a list of parameter slots, and returns {host, budget, returned, kept}, kept a tuple of those slots as the call left them: a builtin's parameter slots, the parameter slots of a function that hands values back, and otherwise the arguments as given.

The generated modules are compiled in parallel, loaded, and their code kept in the cache directory (the application setting :quake_c, :cache_dir, by default the user cache directory's quake_c), named by the program's digest and the compiler's own code (older code for the same program is removed), so a program is compiled once. A program loaded once stays loaded for the life of the node.